Degradation of methylene blue using a novel gas-liquid hybrid DDBD reactor: Performance and pathways

Yao, Xiaomei; Fang, Yingbo; Guo, Yanxun; Xu, Minghao

doi:10.1016/j.chemosphere.2023.139172

Cited by 7 publications

(5 citation statements)

References 38 publications

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“…The CoOOH catalyst was prepared according to the method in previous work [ 17 ]. An amount of 4.3 g of Co(NO 3 ) 2 ·6H 2 O was completely dissolved in 250 mL deionized water, and then an H 2 O 2 solution with a concentration of 30% was added.…”

Section: Methodsmentioning

confidence: 99%

“…The gas–liquid hybrid double dielectric barrier discharge (DDBD) reactor used in this study was the same as in our previous work [ 17 ]. A copper rod (8 mm in diameter and 220 mm in length) was used as the high-voltage electrode.…”

Section: Methodsmentioning

confidence: 99%

“…A UV-vis spectrophotometer (TU-1810, Puxi, Beijing, China) was used to detect the concentration of the MB solution. The calculation methods of removal efficiency, energy efficiency, and the first-order reaction kinetics model were similar to our previous work [ 17 ]. The dissolved O 3 centration (mg L −1 ) in the liquid phase was measured and calculated using indigo disulfonate spectrophotometry (IDS) [ 21 ], the H 2 O 2 concentration (mg L −1 ) in the MB solution was determined using titanium sulfate spectrophotometry, and the ·OH concentration (mol L −1 ) in the MB solution was determined via the salicylic acid probe method.…”

Section: Methodsmentioning

confidence: 99%

“…First, Co 3+ can oxidize with the generated oxide-like intermediates to produce •OH and Co 2+ [40][41][42]. Then, the H 2 O 2 produced by the discharge react with Co 2+ to produce Co 3+ , •OH, and OH − , as shown in Formulas ( 15)- (17). The Co atom of CoOOH participates in this reaction to form •OH, and a cycle is formed, which is shown in Figure 7 (route (3)).…”

Section: Mechanism Of Mb Degradation Via Ddbd Coupled With Cooohmentioning

confidence: 99%

“…DDBD devices, which usually employ an additional dielectric barrier to isolate the metal electrode from the solution to avoid corrosion, have been widely used in water treatment [ 13 , 14 , 15 , 16 ]. The specific DDBD system can be reflected in our previous research work [ 17 ]. In this paper, we chose methylene blue (MB) as the target, which is a model azo dye with a stable molecular structure, and it is difficult to degrade using traditional methods [ 18 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

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In this study, the coupled use of a double dielectric barrier discharge (DDBD) and CoOOH catalyst was investigated for the degradation of methylene blue (MB). The results indicated that the addition of CoOOH significantly promoted MB degradation performance compared to the DDBD system alone. In addition, both the removal rate and energy efficiency increased with an increase in CoOOH dosage and discharge voltage. After 30 min of discharge treatment in the coupled system (with CoOOH of 150 mg), the removal rate reached 97.10% when the discharge voltage was 12 kV, which was 1.92 times that in the single DDBD system. And when the discharge time was 10 min, the energy efficiency could reach 0.10 g (k·Wh)−1, which was 3.19 times better than the one in the single DDBD system. Furthermore, the addition of CoOOH could also significantly enhance the TOC and COD removal rates of MB. In the DDBD-coupled-with-CoOOH system, TOC and COD were 1.97 times and 1.99 times those of the single DDBD system after 20 min of discharge treatment with a discharge voltage of 12 kV and 100 mg of CoOOH. The main active substances detected in the coupled system indicated the conversion of the active species H2O2 and O3 into a more oxidizing ·OH was enhanced through the addition of a CoOOH catalyst, resulting in the more effective decomposition of MB and intermediate molecules.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%